The Public Health Accreditation Board (PHAB) is committed to continuous quality improvement of its standards and measures for voluntary national certification of health departments in the United States. It uses a consensus approach that ensures broad involvement of diverse subject matter experts and researchers in order to have standards that are timely and relevant to health departments that serve diverse populations and have varied governance structures. To date some 400 subject matter experts have been involved in developing and revising accreditation standards and measures on programmatic, contextual, and emerging issues.